CVE-2021-25261 Explained : Impact and Mitigation
Learn about CVE-2021-25261, a local privilege vulnerability in Yandex Browser for Windows allowing attackers to execute arbitrary code with SYSTEM privileges. Take immediate steps to mitigate risk.
A local privilege vulnerability in Yandex Browser for Windows prior to version 22.5.0.862 allows attackers to execute arbitrary code with SYSTEM privileges by manipulating symlinks during the update process.
Understanding CVE-2021-25261
This CVE involves a local privilege vulnerability in Yandex Browser, impacting versions prior to 22.5.0.862.
What is CVE-2021-25261?
The vulnerability in Yandex Browser for Windows enables a local attacker with low privileges to run arbitrary code with SYSTEM privileges by tampering with symlinks during the update process.
The Impact of CVE-2021-25261
Exploitation of this vulnerability could lead to unauthorized execution of malicious code with elevated privileges, potentially causing severe damage to affected systems.
Technical Details of CVE-2021-25261
This section dives into the specifics of the vulnerability.
Vulnerability Description
The flaw in the Yandex Browser allows a local attacker to manipulate symlinks during the update process, leading to the execution of arbitrary code with SYSTEM privileges.
Affected Systems and Versions
Yandex Browser (Desktop) versions prior to 22.5.0.862 for Windows are susceptible to this privilege escalation vulnerability.
Exploitation Mechanism
Attackers can exploit this vulnerability by leveraging the symlink manipulation technique during the Yandex Browser update, granting them elevated privileges.
Mitigation and Prevention
To secure systems from CVE-2021-25261, immediate steps along with long-term security practices should be followed.
Immediate Steps to Take
Users are advised to update Yandex Browser to version 22.5.0.862 or higher to mitigate the vulnerability. Additionally, monitoring for any suspicious activities post-update is recommended.
Long-Term Security Practices
Implementing strict security controls, restricting unauthorized access, and regularly updating software can help prevent similar privilege escalation attacks.
Patching and Updates
Regularly check for security patches and updates released by Yandex to ensure the browser is equipped with the latest security features.